Fujitsu MB3891 Waveform at rapid change of output load, LDO1, Measurement diagram, IC internal

MB3891

Power supply voltage VBAT (V)

4

3

2

1

0

Output voltage falling waveforms (LDO1)

Ta = +25°C
OUT1 = No load
CONT1 = “L”
CONT6 = OPEN	(V)
2	OUT1V
VBAT	voltage
0
1
OUT1
	Output

Power supply voltage VBAT (V)

4

2

0

Output voltage falling waveforms (LDO1)

Ta = +25°C
VBAT	= 1		∝F
OUT1	= No load
CONT1		=	“L”
VBAT CONT6		= OPEN		VOUT1 (V)
			2
				voltage
			0
			1
OUT1
				Output

Input voltage VCONT1 (V)

0 50 100 150 200 250 300 350 400 450 500

t (ms)

Output voltage rising waveforms (LDO1)

4
2
CONT1
0
OUT1	2
	1
Ta = +25°C	0
VBAT = 3.6 V
OUT1 = 18 Ω
CONT6 = OPEN

0 20 40 60 80 100 120 140 160 180 200

t (∝s)

Waveform at rapid change of output load

		0.0	0.2	0.4	0.6	0.8	1.0	1.2	1.4	1.6	1.8	2.0
							t (s)
	(V)	Output voltage falling waveforms (LDO1)
		10
	1
	VCONT	5						CONT1
OUT1(V)	voltage	0						Ta = +25°C					OUT1(V)
								CONT6 = OPEN
								VBAT		= 3.6 V		2.0
								OUT1 = No load
voltageV	Input											1.5	voltageV
												0.5
												1.0
Output								OUT1				0.0	Output
		0	20	40	60	80	100 120 140 160 180 200
						t (ms)

Output voltage VOUT1 (V)

(LDO1)

2.0	OUT1
	Ta = +25°C
1.5
	VBAT = 3.6 V
1.0	CONT1 = “L”
	CONT6 = OPEN
0.5
0.0
	VC

OUT1 = 0 A −120 mA

0 10 20 30 40 50 60 70 80 90 100

t (∝s)

[Measurement diagram]

VBAT = 3.6 V

	(V)	VREF = 1.225 V
	VC
	voltage	(IC internal)	LDO1
2
1	collectorNPN
0

OUT1 120 mA

1 ∝F VC

4 V

0 V

(Continued)

15